泡菜具有独特的风味，适合制作泡菜的食盐水浓度是4%．在配制4%的食盐水2000g时，下列做法：①用80g食盐和2000g水配制溶液；②称量食盐时（1克以下用游码），食盐放在右盘的纸上；③量水的体积时，俯视量筒；④溶解食盐的烧杯内壁是潮湿的；其单一错误会导致溶液浓度偏小的是　____ ．

    Two men walked through the countryside toward another village. As they come to the edge of a river, they saw an old woman sitting there upset because the bridge was____by the storm, and she was too weak to walk across the stream. The first man said____, “We are tall enough, and we can carry you across” The second man thought it troublesome, but he agreed reluctantly（不情愿地）. So the two men ____ the bridge, lifted her between them and carried her across the river. When they got to the other side, they set her down and she went on her way gratefully. After they had walked another mile or so, the second man began to complain “My back began to hurt for lifting her.” The first man ____ smiled and nodded without a word.

小明冬天取暖时发现：电暖器的电热丝热得发红，而与电热丝相连的导线却不怎么热。

如图，图中湖北鄂州（30.23°N，114.52°E）位于甲、乙、丙、丁四地中的（  ）